20 MCQs on Encapsulation and Inheritance in OOP for Beginners

1.What is encapsulation in OOP?

a) Hiding data
b) Inheriting data
c) Copying data
d) Deleting data

2. Encapsulation is also known as?

a) Data wrapping
b) Data linking
c) Data breaking
d) Data joining

3. Which keyword helps in encapsulation?

a) private
b) static
c) void
d) abstract

4. Which concept hides internal data from users?

a) Inheritance
b) Polymorphism
c) Encapsulation
d) Abstraction

5. What is used to access private data?

a) Getters and Setters
b) Loops
c) Functions only
d) Constructors

6. Example of encapsulation?

a) Bank Account balance
b) Dog barks
c) Car speed
d) TV color

7. Main benefit of encapsulation?

a) Data security
b) Faster program
c) More memory
d) Code duplication

8. Which access modifier hides data from other classes?

a) public
b) private
c) internal
d) static

9. In encapsulation, variables are usually marked as:

a) private
b) public
c) global
d) internal

10. Getters and setters are used to:

a) Access and modify private data
b) Delete variables
c) Create classes
d) Inherit functions

11. What is inheritance in OOP?

a) Deriving new class from existing one
b) Hiding data
c) Creating functions
d) Copying variables

12. In inheritance, the existing class is called:

a) Base class
b) Child class
c) Object class
d) Abstract class

13. In inheritance, the derived class is called:

a) Child class
b) Parent class
c) Base class
d) Interface

14. Which is the main benefit of inheritance?

a) Code reusability
b) Data hiding
c) Function duplication
d) None

15. Example of inheritance:

a) Vehicle → Car
b) Dog → Bark
c) Account → Balance
d) School → Teacher

16. Inheritance supports:

a) Reusing code
b) Removing classes
c) Faster I/O
d) Manual data entry

17. Which keyword is used for inheritance in many languages?

a) extends
b) private
c) include
d) call

18. When a child class inherits, it gains:

a) Parent class methods
b) Local variables
c) Only constructors
d) No data

19. Inheritance creates what kind of relationship?

a) “is-a”
b) “has-a”
c) “was-a”
d) “can-do”

20. Multiple inheritance means:

a) A class inherits from more than one class
b) Many methods in one class
c) One class, one method
d) Repeated variables

Wait for 20 seconds...